const path = require('path');

const { getDefaultConfig, mergeConfig } = require('@react-native/metro-config');
const escape = require('escape-string-regexp');
const exclusionList = require('metro-config/src/defaults/exclusionList');

const pak = require('../package.json');

const root = path.resolve(__dirname, '..');
const modules = Object.keys({ ...pak.peerDependencies });

/**
 * @type {import('metro-config').MetroConfig}
 */
const config = {
	watchFolders: [root, path.resolve(__dirname, '../../../node_modules')],
	// We need to make sure that only one version is loaded for peerDependencies
	// So we block them at the root, and alias them to the versions in example's node_modules
	resolver: {
		blockList: exclusionList(
			modules.map(
				m => new RegExp(`^${escape(path.join(root, 'node_modules', m))}\\/.*$`),
			),
		),
		extraNodeModules: modules.reduce((acc, name) => {
			acc[name] = path.join(__dirname, 'node_modules', name);

			return acc;
		}, {}),
		unstable_enableSymlinks: true,
	},
};

module.exports = mergeConfig(getDefaultConfig(__dirname), config);
